Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c4bf7441380e50…

MALICIOUS

PDF

44.5 KB Created: 2020-07-15 07:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: aef5e1b09079df5d4d3767b48e47d996 SHA-1: 0ee5e20c6ee86d0de1bfa72b9144eb2aeb0d90c5 SHA-256: 44c4bf7441380e507241fdb90ab8e2ef729669f5adb9ae7fe9f55e02a2625252
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to harmful sites. The 'PDF_SEO_LINK_FARM' heuristic further suggests a large number of outbound links, typical of SEO poisoning or link farm abuse to drive traffic to malicious destinations. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=three%20little%20pigs%20sequencing%20pdf In PDF document text
    • http://files.fasdxservices.com/uploads/1/3/1/0/131071209/b4d668.pdfIn PDF document text
    • http://files.taimillwork.com/uploads/1/3/0/7/130775102/3679445.pdfIn PDF document text
    • http://files.gplocal42.com/uploads/1/3/1/8/131856293/89d67fc4aed9029.pdfIn PDF document text
    • http://files.learningmanager.ro/uploads/1/3/1/4/131437379/zipixe-xidigirut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6611/3694/files/rorufifazidofagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/nefopumaxejali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/59230474093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/47941881712.pdfIn PDF document text
    • https://rebadatewi.files.wordpress.com/2020/06/40542293136.pdfIn PDF document text
    • https://xukitivusapu.files.wordpress.com/2020/06/88813788481.pdfIn PDF document text
    • https://kudikinojov.files.wordpress.com/2020/06/zomabelifumipalaloleri.pdfIn PDF document text
    • https://jolitogobase57815693.files.wordpress.com/2020/07/50590523223.pdfIn PDF document text
    • https://vokekapababi.files.wordpress.com/2020/06/kalenewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/72950374926.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9480/2583/files/54706915587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/58152453206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/zelijasafexiwiwawuzowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/gepusumusepe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 5056 bytes
SHA-256: 24263c3d6e269efd4e90bfe49a062db19b73ecf01b33669e2ca18ff55aca6a0f
font_01_sfnt_off0000817b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817B 10220 bytes
SHA-256: 9216f8c243f0ba05f07d3be8ccb9ae750c51f69a8312d72eed67e2483da0dc20